For the given each of the electrocyclic reactions, the product formed should be determined. Concept introduction: Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes ( π-system ) , in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring. The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene. The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes ( ring closure ) of the HOMO of conjugated (π-system) polyene. According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions , π-systems Thermal Photochemical 6- π-electrons Disrotatory Conrotatory 8- π-electrons Conrotatory Disrotatory To determine: the major product formed for each of the given electrocyclic reactions.

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Answer 1

Question

Chapter 17, Problem 56PP

(a)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(b)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(c)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(d)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

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SYNTHESIS REACTIONS. For the following reactions, synthesize the given products from the given reactants. Multiple reactions/steps will be needed. For the one of the steps (ie reactions) in each synthesis, write out the mechanism for that reaction and draw an energy diagram showing the correct number of hills and valleys for that step's mechanism. CI b. a. Use acetylene (ethyne) and any alkyl halide as your starting materials Br C. d. "OH OH III. OH

Answer 2

Question

Chapter 17, Problem 56PP

(a)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(b)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(c)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(d)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

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Answer 3

Question

Chapter 17, Problem 56PP

(a)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(b)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(c)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(d)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

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Answer 4

Question

Chapter 17, Problem 56PP

(a)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(b)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(c)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(d)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

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Answer 5

Chapter 17, Problem 56PP

(a)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(b)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(c)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

(d)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 6

Chapter 17, Problem 56PP

(a)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 7

Chapter 17, Problem 56PP

(a)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 8

(b)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 9

(b)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 10

(c)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 11

(c)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 12

(d)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 13

(d)

Interpretation Introduction

Interpretation:

For the given each of the electrocyclic reactions, the product formed should be determined.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
6- π-electrons Disrotatory Conrotatory
8- π-electrons Conrotatory Disrotatory

To determine: the major product formed for each of the given electrocyclic reactions.

Answer 14

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Answer 15

Expert Solution & Answer

Answer 16

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Answer 17

Ch. 17.1 - Prob. 1CC Ch. 17.2 - Prob. 2CC Ch. 17.2 - Prob. 3CC Ch. 17.2 - Prob. 4CC Ch. 17.2 - Prob. 5CC Ch. 17.3 - Prob. 6CC Ch. 17.4 - Prob. 1LTS Ch. 17.4 - Prob. 7PTS Ch. 17.4 - Prob. 8ATS Ch. 17.4 - Prob. 9ATS

π-systems	Thermal	Photochemical
6- π-electrons	Disrotatory	Conrotatory
8- π-electrons	Conrotatory	Disrotatory

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Chapter 17 Solutions